<template>
    <div>
        <!-- 面包屑导航区域 -->
        <el-breadcrumb separator="/">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>参数列表</el-breadcrumb-item>
        </el-breadcrumb>

        <!-- 卡片视图 -->
        <el-card>
            <!-- 警告区域 -->
            <el-alert
                title="注意：只允许为第三级分类设置相关参数"
                type="warning" :closable="false" show-icon>
            </el-alert>

            <!-- 选择商品分类区域 -->
            <el-row class="cat_opt">
                <el-col>
                    <span>选择商品分类：</span>
                    <!-- 选择商品分类的级联选择框 -->
                    <el-cascader
                    v-model="seclectedCateKeys"
                    :options="catelist"
                    :props="cateProps"
                    @change="handleChange"></el-cascader>
                </el-col>
            </el-row>

            <!-- tabs标签页区域 -->
            <el-tabs v-model="activeName" @tab-click="handleTabClick">
                <!-- 添加动态参数的面板 -->
                <el-tab-pane label="动态参数" name="many">
                    <!-- 添加参数的按钮 -->
                    <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">
                        添加参数
                    </el-button>
                    <!-- 动态参数表格 -->
                    <el-table :data="manyTabData" border stripe>
                        <!-- 展开行 -->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!-- 循环渲染Tag标签 -->
                                <el-tag
                                    :key="i"
                                    v-for="(item, i) in scope.row.attr_vals"
                                    closable
                                    @close="handleClose(i,scope.row)">
                                    {{item}}
                                </el-tag>
                                <!-- 输入的文本框 -->
                                <el-input
                                class="input-new-tag"
                                v-if="scope.row.inputVisible"
                                v-model="scope.row.inputValue"
                                ref="saveTagInput"
                                size="small"
                                @keyup.enter.native="handleInputConfirm(scope.row)"
                                @blur="handleInputConfirm(scope.row)"
                                >
                                </el-input>
                                <el-button v-else class="button-new-tag"
                                size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type="index"></el-table-column>
                        <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template>
                                <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>

                </el-tab-pane>
                <!-- 添加静态属性的面板 -->
                <el-tab-pane label="静态属性" name="only">
                    <!-- 添加属性的按钮 -->
                    <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">
                        添加属性
                    </el-button>
                    <!-- 静态属性表格 -->
                    <el-table :data="onlyTabData" border stripe>
                        <!-- 展开行 -->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!-- 循环渲染Tag标签 -->
                                <el-tag
                                    :key="i"
                                    v-for="(item, i) in scope.row.attr_vals"
                                    closable
                                    @close="handleClose(i,scope.row)">
                                    {{item}}
                                </el-tag>
                                <!-- 输入的文本框 -->
                                <el-input
                                class="input-new-tag"
                                v-if="scope.row.inputVisible"
                                v-model="scope.row.inputValue"
                                ref="saveTagInput"
                                size="small"
                                @keyup.enter.native="handleInputConfirm(scope.row)"
                                @blur="handleInputConfirm(scope.row)"
                                >
                                </el-input>
                                <el-button v-else class="button-new-tag"
                                size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type="index"></el-table-column>
                        <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template>
                                <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
            </el-tabs>
        </el-card>
        <!-- 添加参数的对话框 -->
        <el-dialog
        :title="'添加' + titleText"
        :visible.sync="addDialogVisible"
        width="50%"
        @close="addDialogClosed">
        <!-- 添加参数的表单 -->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
                <el-form-item :label="titleText" prop="attr_name" >
                    <el-input v-model="addForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="addDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="addParams">确 定</el-button>
            </span>
        </el-dialog>
        <!-- 修改参数的对话框 -->
                <el-dialog
        :title="'添加' + titleText"
        :visible.sync="editDialogVisible"
        width="50%"
        @close="editDialogClosed">
        <!-- 修改参数的表单 -->
            <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
                <el-form-item :label="titleText" prop="attr_name" >
                    <el-input v-model="editForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="editDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="editParams">确 定</el-button>
            </span>
        </el-dialog>

    </div>
</template>
<script>
export default {
    data() {
        return {
            catelist: [],
            cateProps: {
                expandTrigger: 'hover',
                value: 'cat_id',
                label: 'cat_name',
                children: 'children'
            },
            // 级联选择框双向绑定的数组
            seclectedCateKeys: [],
            activeName: 'many',
            // 动态参数数据
            manyTabData: [],
            // 静态属性数据
            onlyTabData: [],
            // 控制添加对话框的显示与隐藏
            addDialogVisible: false,
            // 添加参数的表单数据对象
            addForm: {},
            // 添加参数的表单验证规则对象
            addFormRules: {
                attr_name:
                [{ required: true, message: '请输入参数名称', trigger: 'blur' }]
            },
            // 控制修改对话框的显示与隐藏
            editDialogVisible: false,
            // 修改参数的表单数据对象
            editForm: {},
            // 修改参数的表单验证规则对象
            editFormRules: {
                attr_name:
                [{ required: true, message: '请输入参数名称', trigger: 'blur' }]
            }
        }
    },
    created() {
        this.getCateList()
    },
    methods: {
        // 获取商品列表
        async getCateList() {
            const { data:res } = await this.$http.get('categories')
            if(res.meta.status !== 200){
                return this.$message.error('获取商品分类失败')
            }
            // 把列表数据赋值给cateList
            this.cateList = res.data
        },
        // 级联选择框选项变化，会触发这个函数
        async handleChange() {
           this.getParamsData()
        },
        async getParamsData() {
             // 证明选中的不是三级分类
            if(this.seclectedCateKeys.length !== 3){
                this.seclectedCateKeys = []
                this.manyTabData = []
                this.onlyTabData = []
                return
            }
            // 证明选中的是三级分类
            console.log(this.seclectedCateKeys)
            // 根据所选的分类的Id，和当前所处的面板，获取对应的参数
            const { data:res } = this.$http.get(`categories/${this.cateId}/attributes`, {
                params: { sel: this.activeName }
            })

            if(res.meta.status !== 200){
                return this.$message.error('获取参数列表失败')
            }
            console.log(res.data)
            res.data.forEach(item => {
               item.attr_vals = (item.attr_vals !== []) ? item.attr_vals.split('') : []
                // 控制文本框的显示与隐藏
                item.inputVisible = false
                // 给每一个item绑定一个值，文本框中输入的值
                item.inputValue = ''
            })
            if(this.activeName === 'many'){
                // 获取动态参数
                this.manyTabData = res.data
            }else {
                // 获取静态属性
                this.onlyTabData = res.data
            }
        },
        // tab标签页点击事件的处理函数
        handleTabClick(){
            // console.log(this.activeName)
           this.getParamsData()
        },
        // 监听添加对话框的关闭事件
        addDialogClosed() {
            this.$refs.addFormRef.resetFields()
        },
        // 监听修改对话框的关闭事件
        editDialogClosed() {
            this.$refs.editFormRef.resetFields()
        },
        // 点击按钮，添加参数
        addParams() {
            this.$refs.addFormRef.validate(async valid => {
                if(!valid) return
                const { data:res } = await this.$http.post(
                    `categories/${this.cateId}/attributes`, {
                        attr_name: this.attr_name,
                        attr_sel: this.activeName
                        })

                if (res.meta.status !== 201) {
                return this.$message.error('添加参数失败！')
                }
                this.$message.success('添加参数成功！')
                this.addDialogVisible = false
                this.getParamsData()
            })
        },
        // 点击按钮，修改参数
        editParams() {
                this.$refs.editFormRef.validate(async valid => {
                if(!valid) return
                const { data:res } = await this.$http.put(
                    `categories/${this.cateId}/attributes${this.editForm.attr_id}`, {
                        attr_name: this.editForm.attr_name,
                        attr_sel: this.editForm.activeName
                        })

                if (res.meta.status !== 200) {
                return this.$message.error('修改参数失败！')
                }
                this.$message.success('修改参数成功！')
                this.addDialogVisible = false
                this.getParamsData()
            })
        },
        // 点击按钮，展示修改对话框
        async showEditDialog(attrId) {
            // 查询当前参数的信息
            const { data:res } = this.$http.get(`categories/${this.cateId}/attributes/${attrId}`, {
                params: { attr_sel: this.activeName }
            })
            if (res.meta.status !== 200) {
                return this.$message.error('获取参数信息失败！')
            }
            this.editForm = res.data
            this.editDialogVisible = true
        },
        // 点击按钮，删除参数信息
        async removeParams(attrId) {
            // 确认删除弹出框业务逻辑
            const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
                }).catch(err => err)
                // 用户取消了删除的操作
                if(confirmResult !== 'confirm'){
                    return this.$message('已取消删除')
                }
            // 删除的业务逻辑
            const { data:res } = this.$http.delete(`categories/${this.cateId}/attributes/${attrId}`)
            if (res.meta.status !== 200) {
                return this.$message.error('删除参数失败！')
            }

            this.$message.success('删除参数成功！')
            this.getParamsData()
        },
        // 文本框失去焦点或者enter弹起触发
        async handleInputConfirm(row) {
            // 优化：如果输入内容为空格，则内容清空
            if(row.inputValue.trim().length === 0){
                row.inputValue = ''
                row.inputVisible = false
                return
            }
            // 如果没有return，则证明输入内容有效,保存数据
            this.saveAttrVals(row)
        },
        async saveAttrVals(row) {
        // 需要发起请求，保存这次操作
        const { data: res } = await this.$http.put(
            `categories/${this.cateId}/attributes/${row.attr_id}`,
            {
            attr_name: row.attr_name,
            attr_sel: row.attr_sel,
            attr_vals: row.attr_vals.join(' ')
            }
        )
        if (res.meta.status !== 200) {
            return this.$message.error('修改参数项失败！')
        }
        this.$message.success('修改参数项成功！')
        },
        // 点击x，删除对应的参数可选项
        handleClose(i, row){
            row.attr_vals.splice(1, i)
            this.saveAttrVals(row)
        },
        // 点击按钮，显示文本框
        showInput(row) {
            row.inputVisible = true
            // $nextTick 方法的作用，就是当页面上元素被重新渲染之后，才会指定回调函数中的代码
            this.$nextTick(_ => {
            this.$refs.saveTagInput.$refs.input.focus()
            })
        }
    },
    computed: {
        // 如果按钮需要被禁用则返回true，否则返回false
        isBtnDisabled() {
            if(this.seclectedCateKeys !== 3){
                return false
                // 没有数据，为了写下去，正确为true
            }else {
                return false
            }
        },
        // 这是当前选中的三级分类的Id
        cateId() {
            if(this.seclectedCateKeys.length === 3){
                return this.seclectedCateKeys[2]
            }
            return null
        },
        // 动态计算标题的内容
        titleText() {
            if(this.activeName === 'many'){
                return '动态参数'
            } else {
                return '静态属性'
            }
        }
    }
}
</script>
<style lang="less" scoped>
.cat_opt {
  margin: 15px 0;
}

.el-tag {
  margin: 10px;
}

.input-new-tag {
  width: 120px;
}
</style>